After driving a 35 foot class a for 12 years I did try many times to find the best price. After around 5 years, I decided it was a silly thing to be doing because the potential for being in a place where I'd be stuck was too great. So then I tended to stop at truck stops...the 2nd tier type places, Sinclair and others.
Now that I'm driving a 35 foot and pulling a toad, I'm 60 foot long. That is nothing to mess with. The attempts to find the lowest prices are gone. Now it's only one thing...will it be easy to get into the station, buy my 45 gallons of diesel and leave? That's all I care about now. Price is 2nd or 3rd.
I drive until I'm at 1/2 tank of my 90 gallons, and then start looking for somewhere convenient.